#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for (int i = a; i < b; i++)
using ll = long long;

int main(){
	ll n, m, t;
	cin >> n >> m >> t;
	vector<ll> a(m), b(n);
	rep(i, 0, m) cin >> a[i];
    rep(i, 0, m) {
        b[a[i] - 1]++;
    }
    ll l = 0, h = 1e18;
    while(h - l > 1) {
        ll mid = (l + h) / 2;
        ll x = 0, y = 0;
        rep(i, 0, n) {
            if(b[i] > mid) x += b[i] - mid;
        }
        rep(i, 0, n) {
            if(b[i] < mid) {
                ll r = mid - b[i];
                y += r / t;
            }
        }
        if(x == 0 || x <= y) h = mid;
        else l = mid;
    }
	cout << h << endl;
}